Preliminary Work

If a new control unit has to be installed, the values/coding must be read out using > 9818 - PIWIS Tester II prior to removing the "old" DME control unit.
> 247055 REPLACING DME CONTROL UNIT

> 247019 REMOVING AND INSTALLING DME CONTROL UNIT - section on "Reading out"
Lift up cowl panel cover.
> WM 508719 REMOVING AND INSTALLING COWL PANEL COVER (EXCEPT PANAMERA EXECUTIVE, PANAMERA 4S SPORT EDITION, PANAMERA 4 EXECUTIVE)
Remove rubber beading in front of the cross panel.
Unscrew the two fastening screws on the cross panel section at the right and lift up the cross panel section.
> WM 508119 REMOVING AND INSTALLING CROSS PANEL (DISASSEMBLING PLENUM PANEL) (EXCEPT PANAMERA EXECUTIVE, PANAMERA 4S SPORT EDITION, PANAMERA 4 EXECUTIVE)